BUGFIX: arm: data abort in get_bad_stack_swi
When swi instruction is executed, it is expected to get message
"software interrupt" in console and dump registers and reboot, as
do_software_interrupt() in arch/arm/lib/interrupts.c.
But, actually it causes data abort accessing wrong address in get_bad_stack_swi
macro in arch/arm/cpu/v7/start.S.
This patch fixes this problem.
The same mistake in arch/arm/cpu/{arm1136,arm1176,pxa}/start.S.
Signed-off-by: Tetsuyuki Kobayashi <koba@kmckk.co.jp>
diff --git a/arch/arm/cpu/arm1136/start.S b/arch/arm/cpu/arm1136/start.S
index ad24b80..ccea2d5 100644
--- a/arch/arm/cpu/arm1136/start.S
+++ b/arch/arm/cpu/arm1136/start.S
@@ -388,8 +388,9 @@
str r0, [r13] @ save R0's value.
ldr r0, IRQ_STACK_START_IN @ get data regions start
str lr, [r0] @ save caller lr in position 0 of saved stack
- mrs r0, spsr @ get the spsr
+ mrs lr, spsr @ get the spsr
str lr, [r0, #4] @ save spsr in position 1 of saved stack
+ ldr lr, [r0] @ restore lr
ldr r0, [r13] @ restore r0
add r13, r13, #4 @ pop stack entry
.endm
diff --git a/arch/arm/cpu/arm1176/start.S b/arch/arm/cpu/arm1176/start.S
index 1fc1da0..f20da8e 100644
--- a/arch/arm/cpu/arm1176/start.S
+++ b/arch/arm/cpu/arm1176/start.S
@@ -393,9 +393,11 @@
/* save caller lr in position 0 of saved stack */
str lr, [r0]
/* get the spsr */
- mrs r0, spsr
+ mrs lr, spsr
/* save spsr in position 1 of saved stack */
str lr, [r0, #4]
+ /* restore lr */
+ ldr lr, [r0]
/* restore r0 */
ldr r0, [r13]
/* pop stack entry */
diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
index 64008ba..61da7ac 100644
--- a/arch/arm/cpu/armv7/start.S
+++ b/arch/arm/cpu/armv7/start.S
@@ -463,9 +463,10 @@
@ spots for abort stack
str lr, [r0] @ save caller lr in position 0
@ of saved stack
- mrs r0, spsr @ get the spsr
+ mrs lr, spsr @ get the spsr
str lr, [r0, #4] @ save spsr in position 1 of
@ saved stack
+ ldr lr, [r0] @ restore lr
ldr r0, [r13] @ restore r0
add r13, r13, #4 @ pop stack entry
.endm
diff --git a/arch/arm/cpu/pxa/start.S b/arch/arm/cpu/pxa/start.S
index 3e07c7c..ada91a6 100644
--- a/arch/arm/cpu/pxa/start.S
+++ b/arch/arm/cpu/pxa/start.S
@@ -385,8 +385,9 @@
str r0, [r13] @ save R0's value.
ldr r0, IRQ_STACK_START_IN @ get data regions start
str lr, [r0] @ save caller lr in position 0 of saved stack
- mrs r0, spsr @ get the spsr
+ mrs lr, spsr @ get the spsr
str lr, [r0, #4] @ save spsr in position 1 of saved stack
+ ldr lr, [r0] @ restore lr
ldr r0, [r13] @ restore r0
add r13, r13, #4 @ pop stack entry
.endm